Mixamo FBX and animation to blender
After some time and (walk outside), I got to find some sort of solution,

I used the Mixamo Collada (.dae) export that opened (after import to blender) as an armature only (no model included, Not sure why but anyway).

The difference is that the .dae file was correctly animated with no armature distortion/twists.  

here is armature in the animation (sleeping position)


than I imported .fbx model in T-pose that I also run thru the Mixamo ridging process, to make the armatures matching with the (.dae). 

there is some issue with the T-pose in Mixamo exports as I found in this coment on youtube (god bless him)


And then I swap the armatuers of the .fbx model
in hierarchy -> right click on armature(the one you want to !change!) ->  select 'remap User' -> in drop down menu by 'New ID' select the new armature that has the animation. 

 


There is some issue with the hip bone of the .dae armature but that should not be too difficult to solve. 

hope I can help someone, If there is better solution how to get the mixamo Characters (animations) work good, pls post the answer ( I have tried to look countless tutorials ( most of them old by now ) and I think that things has changed and nothing of that worked for me.